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- W1987001574 abstract "Piwi-interacting RNAs (piRNAs) ensure transposable element silencing in Drosophila, thereby preserving genome integrity across generations. Primary piRNAs arise from the processing of long RNA transcripts produced in the germ line by a limited number of telomeric and pericentromeric loci. Primary piRNAs bound to the Argonaute protein Aubergine then drive the production of secondary piRNAs through the ping-pong amplification mechanism that involves an interplay with piRNAs bound to the Argonaute protein Argonaute-3. We recently discovered that clusters of P-element-derived transgenes produce piRNAs and mediate silencing of homologous target transgenes in the female germ line. We also demonstrated that some clusters are able to convert other homologous inactive transgene clusters into piRNA-producing loci, which then transmit their acquired silencing capacity over generations. This paramutation phenomenon is mediated by maternal inheritance of piRNAs homologous to the transgenes. Here we further mined our piRNA sequencing data sets generated from various strains carrying transgenes with partial sequence homology at distinct genomic sites. This analysis revealed that same sequences in different genomic contexts generate highly similar profiles of piRNA abundances. The strong tendency of piRNAs for bearing a U at their 5' end has long been recognized. Our observations support the notion that, in addition, the relative frequencies of Drosophila piRNAs are locally determined by the DNA sequence of piRNA loci." @default.
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- W1987001574 date "2013-08-01" @default.
- W1987001574 modified "2023-09-27" @default.
- W1987001574 title "Profiles of piRNA abundances at emerging or established piRNA loci are determined by local DNA sequences" @default.
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- W1987001574 doi "https://doi.org/10.4161/rna.25756" @default.
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